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(2×1+2S+7(-2))=0
2+2S+(-14)=0
2S-12=0
2S=+12
S=12/2=+6
Jadi,jawabannya D
H = +1 * 2 = + 2
O = -2 * 7 =-14
Maka S₂ adalah + 12 dengan nilai S = + 6 (D)